Shedding device for dobbies



H. GROSSMANN 1,921,521

SHEDDING DEVICE FOR DO BBIES Filed July 20. 1931 3 Sheets-Sheet 1 Aug. 8, 1933. H. GROSSMANN ,5

SHEDDING DEVICE FOR DOBBIES Filed July 20. 1951 5 Sheets-Sheet 2 KY; 4 W

Aug. 8, 1933. H. GROSSMANN 1,921,521

SHEDDING DEVICE FOR DOBBIES Filed July 20. 1931 3 Sheets-Sheet 3 "H1 Gross mamn hive/411K Patented Aug. 8 1933 t Y t v "i entree STATES PATENT OFFICE f i 1,921,521 I g r V I t Q Q SHEDDING DEVICE FOR DOBBIES' 'Hans Grossmamnfiongg near Zurich, Switzerland, assignor to Gebr. Staubli & 00., Horgen, Switzerland Application July 20, 1931, Serial No. 552,041, and in Switzerland September 17, 1930 8 Claims. (01. sm-6 6) Dobbies areknown in which the advancing and suspended "shaft, the difference becoming amaxilagging (also called fluttering or. flying and 'mum in the position B, and being compensated standing of the shafts) are brought about by for by an acceleration of the movement. in the relative 'angular'movements of two swing levers second half. The shafts that are actuatedby carrying the same lifting knife. There are also 'the levers f are at first accelerated by the coro0 dobbies in which for the same purpose, in the responding'cam inthe earlier part of their moveweaving of plain weaves, individual hooks can ment. The difference likewise reaches a maxiadvance beyond the others. mum in the position B, shown in Figure 2, and

According to the present invention, the flutthese shafts then undergo a retardation, so that tering is accomplished by vinterposing of levers in the position C, shown in Figure 3, all the '65 between the dobby and the shafts,which levers shafts are again at the same level. By these by means of cam guides produce anaccelerating variations of shedding, different planes of crossor retarding supplementary movement, so that ing are accordingly obtained. The curvatures the crossing of the warp threads, instead of 00- of the levers f and of the levers i may be formed curring in one plane, is-distributed amongst a in any desired manner. .70

plurality of superposed planes. The lever con- It is therefore possible to'employ more than struction is such thatthe levers may differ in two diiferent sorts of levers and thereby to in-. position at will from one shaft to another. crease to any desired extent the number of planes Three constructional exampleslof the invenof intersection. Similarly by suitable shaping tion are illustrated in the accompanying drawthe result can be obtained that individual shafts/I ings, in which only begin to rise or fall after the normally sus- Figures 2 and 3 Show the first amp in pended shafts, if required. The levers f f side elevationin three different p sitions, ,f admit of "being readily substituted for one an- Figure 4 h a P a Of the devlc s 1n the D other, and employed in any desiredsequence ac- 20 tion shown in Figure Land cording to the pattern to. be produced, in which Fi u 5 ShOWS a movement diagram'of 13W07 case between two such levers a connecting bar sha which a q pp d w l v according of the same length as the connecting bars atto the invention. I I tached to the pins 71. can be directly hooked on The" dot-and-dash line shows the diagram of t t pins of a standing lever w such .130 a normally moving shaft. fluttering or separation is not wanted, all the Flgures a d 7 are slde-elevatlons 9 the connecting bars e are directly hooked on to the 0nd and t l eXamp1epins g on the levers a, all the intermediate levers In Figures 1 to 4, a is a standing lever, rotatf being omittei able about a pivot b, and'swung to and fro by This device can be applied not, only to new 35 hodks c1 a 32 ou the medium of a la c machines but also to old machines that are al-" l Q d in aknOW-f} manner betweenthe posltlons ready in operation. If suitably constructed it is llndlcated b the hnes A and r also a'pplicable to hanging or suspended levers'a.

e n th? standlng levers a bars 6 The dam surfacesthat produce the accelera- 40 leadlylgto e 39101; levers lfavers f j in) tion or retardation of the shafts, instead. of being are mterposed m any deslred Sequence cone arranged on the levers i may be arranged on spondmg to the pattern .These levers "arms which are set upon the pivots 7c and n loosely suspended from the pivots g on the standand upon which by means rollers levers ing levers and they each carry pm on Whlch allowed to run which are supported iii the m r:

the connecting bar e is hooked on. The periph- I 45 eral curves of the levers '1 roll while raising the 1161' luustrated for the levers f and Whlch Carry the connecting bars 6.

shaft upon rollers i, which are mounted loose upon a pivot k Supported a bracket L Levers corresponding in their action to the n Figures 1 2 and 3, and also in the diagram levers f illustrated may also be interposed at anf Figure 5 A denotes th initial position f the other position in the connection of the dobbies 50 tanding 1 and of t haft the mid with the shafts. .Thus for example the lever a position and C the end position, when t shed attached to the balance lever d itself admits of is open. All the shafts begin to rise togetherbeingconst u t as 811011 a n e ced by '(Fig. 1). Owing to the retarding su plementary a li in gui e, 01" e uch a lever may-be'fitted movement produced by the lever f the correinto the j c ev s he elves.

55 'sponding shaft at first lags behind the normally An "example of this last mentioned kind is shown by Fig. 6. Here the connecting bar 2 is connected with the upper arm of a lever o to the lower arm of which a lever is hooked on by means of a pin 9. To said lever f two shaft-cords p are attached. By the pull of the shaft u the curved upper edge s of the lever f is maintained in contact with a stationary, roller 'r. a

When the connecting bar 6 is drawn towards the right the point It receives an alternatelyac celerated and. retarded movement by means "of;

the curvatures s passing below the rollers r. By suitably choosing the form of the'lever edge s similar differences in the course of movement of vicinal levers can be obtained as with the curve-Q shaped levers P, f of the first described example. In the modified form according-toFig. 7 which represents the device in its middle position,- levers f f are pivoted on a pin g mounted on a shortened standing lever a and have their curvedends directed upwardly so as to extend below a series of rollers i, the common shaft of which is mounted in brackets t wherein it may be adjusted in vertical direction" The connecting bars e are hooked on to these levers by means of pins'h. (For sake of clearness, the pin h on the lever f the associated connecting'bar cjjack levers J and 7' and shaft u only are shown in the drawing). The jack shafts 7 and 9 are of well known construction and are disclosed in U. S. 'Patent No. 1,514,873. A third lever, F, is made without curvature and serves only to connect a lever a with'the associated connecting .bar 6 to transmit thereto an ordinary uniform movement. Obviously the arrangement of the various levers f (f F, f can be easily adapted to the sp'ecial"1'equi1'ements of each singular case of use, viz. for instance to the kind of the material to be used, to the pattern to be produced.

What I claim is:

' '1'. A shedding device for dobbies, comprising shafts and levers interposed .between the dobby and its shafts, means adapted to impart oscillatory movements to these levers, cam guides in lsuchrelation tosaid levers as to produce anacc'elerating or retarding supplementary movement of the shafts duringthe oscillatory movement of "said levers. g 2.'A shedding device for dobbies, comprising.

"shafts and leversinterposed between the dobby and its shafts, dissimilarly curved portions on these 1evers,'guiding members adapted to coact With said curved portions and means for imparting reciprocating movements to said levers, relatively to said guiding members.

3. A shedding device for dobbies, comprising shafts and levers interposed between the dobby and its shafts, the pivots of these levers being mounted in bearings adapted to perform a reciproc'ating movement, dissimilar cam guides on said 7 levers, stationary guiding members arranged in "the reach of these cam guides, jack-levers carryingthe shafts, members connected on one side 'withsaid jack-levers and on the other side with the first mentioned levers in such a manner as to hold the cam guides of the levers in contact-with said guiding members by the weight of the shafts as the levers move.

4. A shedding device for dobbies, comprising shafts and standing levers adapted to perform a reciprocating motion, intermediate levers suspended from such standing levers, connecting bars hooked on said intermediate levers outside their axis of osci1lation,"a jack-lever connected with each of said connecting bars, curvatures on *mentary movement relatively to the movement said intermediate levers, guiding members in reach of these curvatures, these curvatures being held in contact with said guiding members during the reciprocating movements of the standing levers by means of the draft exerted by the connecting bars in such a manner that, according to the form of the curvatures, said connecting bars and therewith the dobby shafts receive alternately an accelerating and retarding suppleof the axis of rotation of the intermediate levers.

thus a different movement toconnecting-bars e100 1 connected with intermediate levers havingtdifferent peripheral curves, the-relative positions: of the axis of rotation of the intermediatea levers on the standing'levers and the pointsof connection of theconnecting-bars on said: levers .being l05 such that the intermediate levers can easily. be changed from onestanding lever to another and that any of said connecting bars, with unaltered length andwithout changing :the basic position of the dobby'shafts, can be optionally suspended lll) either'from the intermediate "levers. or directly from the standing levers.

6. A shedding device for dobbies, comprising. a series of connecting members adapted to perform a reciprocating motion; leverspivotably,mountedsili onhorizontal pivots and connected" each to' one ofsaid connecting members, a shaft connected with each of these levers, a second lever-inserted between a determined number ofsaid-leversand the associated shaftsand suspended from 1saidi120 levers, a guiding memberabove each 'of'saidisuspended levers, a peripheralcurve on-the'upper edge of these levers adapted to .be-held in contact with said guiding: member by the' weightof the associated shaft and to] impart to-this an. alter-" nately accelerated. and retarded. movementiwhen the corresponding upper-lever 'is actuatedby: the

connecting member, said peripheral-curves:being different on two vicinal levers.

7. A shedding-device for; dobbies, com-prising, 21 series of standing levers adapted .toperformwreciprocating movements,- an intermediate *lever pivotally mountedon each .of said standing levers, a connecting bar pivotably connected; With each of said intermediate levers jack' levers icon- 'nected'with the other end of saidconnectingbars, different peripheral curves on aedetermined number of said intermediate levers, a stationaryguid- 'ing member for-each of: such curves-,qeach curve being held in contact with a guiding memberdur =140 ring the movement of thestandingleversupporting the intermediate lever and-so-formedthat as the standing lever moves, the point of'qconnection located onsaid intermediate leverrof the connecting bar leading to the jack lever-undergoes e445 --supplementarymovement :which .is dependent upon the shapeof thecurve. v

8. A'shedding device for dobbiesycomprising a series of standing levers adapted taper-form a "swinging motion at--predetermined moments, a

jack-lever connected with each of these standing levers, a bar forming part of this connection, intermediate levers between such connecting members and the associated standing lever having their axis of rotation on this standing lever, different curvatures on a determined number'of said intermediate levers, guiding members in such a position relatively to such intermediate levers that the curvatures thereon are held in contact with said guiding-members by the draft of the HANS GROSSMANN. 

